D. Vatchev, T., and I. T. Yanashkov. “Preliminary Report on Stem and Root Rot, a Novel Disease of Cultivated Mursalitza Mountain Tea (Sideritis Scardica Griseb.), First Observed in Bulgaria”. Bulgarian Journal of Agricultural Science, vol. 29, no. 5, Oct. 2023, pp. 882-5, https://agriacad.eu/ojs/index.php/bjas/article/view/1208.